Arthur C Clarke - City And The Stars Read online

  "Why won't you do what i tell you?" asked alvin, wh he had recovered from his astonishment. "It is forbidden," came the reply. "Forbidden by whom?" "i do not know." "then how-no, cancel that. Was the order built into you?" "no." that seemed to eliminate one possibility. The builders of these domes might well have been the race who made the robot, and might have included this taboo in the machine's original instructions. "When did you receive the order?" asked alvin. "I received it when i landed." alvin turned to hilvar, the light of a new hope burning in his eyes. "There's intelligence here! Can you sense it?" "no," hilvar replied. "This place seems as dead to me as the first world we visited." "i'm going outside to join the robot. Whatever spoke to it may speak to me." hilvar did not argue the point, though he looked none too happy. They brought the ship to earth a hundred feet away from the dome, not far from the waiting robot, and opened the air lock. Alvin knew that the lock could not be opened unless the ship's brain had already satisfied itself that the atmosphere was breathable. For a moment he thought it had made a mis­take-the air was so thin and gave such little sustenance to his lungs. Then, by inhaling deeply, he found that he could grasp enough oxygen to survive, though he felt that a few minutes here would be all that be could endure. Panting hard, they walked up to the robot and to the curv­ing wall of the enigmatic dome. They took one more step­then stopped in unison as if hit by the same sudden blow. In their minds, like the tolling of a mighty gong, had boomed a single message:

  Danger. Come no closer.

  That was all. It was a message not in words, but in pure thought. Alvin was certain that any creature, whatever its level of intelligence, would receive the same warning, in the same utterly unmistakable fashion-deep within its mind. It was a warning, not a threat. Somehow they knew that it was not directed against them; it was for their own protection. Here, it seemed to say, is something intrinsically dangerous, and we, its makers, are anxious that no one shall be hurt through blundering ignorantly into it. Alvin and hilvar stepped back several paces, and looked at each other, each waiting for the other to say what was in his mind. Hilvar was the first to sum up the position. "I was right, alvin," he said. "There is no intelligence here. That warning is automatic-triggered by our presence when we get too close." alvin nodded in agreement. "I wonder what they were trying to protect," he said.: "there could be buildings-anything-under these domes." "there's no way we can find out, if all the domes warn us off. It's interesting-the difference between the three planets we've visited. They took everything away from the first-they abandoned the second without bothering about it -but they went to a lot of trouble here. Perhaps they expected to come back some day, and wanted everything to be ready for them when they returned." "but they never did-and that was a long time ago." "they may have changed their minds." it was curious alvin thought, how both he and hilvar had unconsciously started using the word "they." whoever or whatever "they" had been, their presence had been strong on that first planet-and was even stronger here. This was a world that had been carefully wrapped up, and put away until it might be needed again. "Let's go back to the ship," panted alvin. "I can't breathe properly here." as soon as the air lock had closed behind them, and they were at ease once more, they discussed their next move. To. Make a thorough investigation, they should sample a large number of domes, in the hope that they might find one that had no warning and which could be entered. If that failed­ alvin would not face that possibility until he had to. He faced it less than an hour later, and in a far more dramatic form than he would have dreamed. They had sent: the robot down to half a dozen domes, always with the same, result, when they came across a scene that was badly out of place on this tidy, neatly packaged world. Below them was a broad valley, sparsely sprinkled with' the tantalizing, impenetrable domes. At its center was the unmistakable scar of a great explosion-an explosion that had thrown debris for miles in all directions and burned a shallow crater in the ground. And beside the crater was the wreckage of a spaceship.

  Twenty-one

  They landed close to the scene of this ancient tragedy and walked slowly, conserving their breath toward mense, broken hull towering above them. Only a short section -either the prow or the stern-of the ship remained; pre­sumably the rest had been destroyed in the explosion. As they approached the wreck, a thought slowly dawned in al­vin's mind, becoming stronger and stronger until it attained the status of certainty. "Hilvar," he said, finding it hard to talk and walk at the same time, "i believe this is the ship that landed on the first planet we visited." hilvar nodded, preferring not to waste air. The same idea had already occurred to him. It was a good object lesson, he thought, for incautious visitors. He hoped it would not be lost on alvin. They reached the hull and stared up into the exposed in­terior of the ship. It was like looking into a huge building that had been roughly sliced in two; floors and walls and ceil­ings, broken at the point of the explosion, gave a distorted chart of the ship's cross section. What strange beings, won­dered alvin, still lay where they had died in the wreckage of their vessel? "I don't understand this," said hilvar suddenly. "This portion of the ship is badly damaged, but it's still fairly in­tact. Where's the rest of it? Did it break in two out in space, and this part crash here?" not until they had sent the robot exploring again, and had themselves examined the area around the wreckage, did they learn the answer. There was no shadow of doubt; any reservations they might have had were banished when alvin found the line of low mounds, each ten feet long, on the little hill beside the ship. "So they landed here," mused hilvar, "and ignored the warning. They were inquisitive, just as you are. They tried to open that dome." he pointed to the other side of the crater, to the smooth, still unmarked shell within which the departed rulers of this world had sealed their treasures. But it was no longer a dome; it was now an almost complete sphere, for the ground in which it had been set had been blasted away. "They wrecked their ship, and many of them were killed. Yet despite that, they managed to make repairs and leave again, cutting off this section and stripping out everything of value. What a task that must have been!" alvin scarcely heard him. He was looking at the curious marker that had first drawn him to this spot-the slim shaft pinged by a horizontal circle a third of the way down from its up. Alien and unfamiliar though it was, be could respond to the mute message it had carried down the ages. Underneath those stones, if he cared to disturb them, was the answer to one question at least. It could remain unan­swered; whatever these creatures might have been, they had earned their right to rest.

  Hilvar scarcely heard the words alvin whispered as walked slowly back to the ship. "I hope they got home," he said. "And where now?" asked hilvar, when they were once more out in space. Alvin stared thoughtfully at the screen before replying. "Do you think i should go back?" he said. "It would be the sensible thing to do. Our luck may ad hold out much longer, and who knows what other surprise these planets may have waiting for us?" it was the voice of sanity and caution, and alvin wad now prepared to give it greater heed than he would have done a few days before. But he had come a long way, and waited all his life, for this moment; he would not turn bar while there was still so much to see. "We'll stay in the ship from now on," he said, "and wn won't touch surface anywhere. That should be safe enough surely." hilvar shrugged his shoulders, as if refusing to accept any responsibility for what migt happen next. Now that alvin was showing a certain amount of caution, he thought it unwise to admit that he was equally anxious to continu! Their exploring, though he had long ago abandoned all hopl of meeting intelligent life upon any of these planets. A double world lay ahead of them, a great planet with 1 smaller satellite beside it. The primary might have been the twin of the second world they had visited; it was clothed it that same blanket of livid green. There would be no point it landing here; this was a story they already knew. Alvin brought the ship low over the surface of the satellite, he needed no warning from the complex mechanism which protected him to know that there was no atmosphere here. Al shadows had a sharp, clean edge, and ther
e were no gradation between night and day. It was the first world on which he had seen something approaching night, for only one of the more distant suns was above the horizon in the area where they made first contact. The landscape was bathed in a dull rep light, as though it had been dipped in blood. For many miles they flew above mountains that were sti) as jagged and sharp as in the distant ages of their birth. This was a world that had never known change or decay, hay never been scoured by winds and rains. No eternity circuit were needed here to preserve objects in their pristine fresh ness. But if there was no air, then there could have been no life -or could there have been? "Of course," said hilvar, when alvin put the question d him, "there's nothing biologically absurd in the idea. Lift can't originate in airless space-but it can evolve forms that will survive in it. It must have happened millions of times, whenever an inhabited planet lost its atmosphere." "but would you expect intelligent life forms to exist in a vacuum ? Wouldn't they have protected themselves against the loss of their air?" "probably, if it occurred after they achieved enough in­telligence to stop it happening. But if the atmosphere went while they were still in the primitive state, they would have to adapt or perish. After they had adapted, they might then develop a very high intelligence. In fact, they probably would-the incentive would be so great." the argument, decided alvin, was a purely theoretical one, as far as this planet was concerned. Nowhere was there any sign that it had ever borne life, intelligent or otherwise. But in that case, what was the purpose of this world? The entire multiple system of the seven suns, he was now certain, was artificial, and this world must be part of its grand design. It could, conceivably, be intended purely for ornament to provide a moon in the sky of its giant companion. Even in that case, however, it seemed likely that it would be put to some use. "Look, said hilvar, pointing to the screen. "Over there, on the right." alvin changed the ship's course, and the landscape tilted around them. The red-lit rocks blurred with the speed of their motion; then the image stabilized, and sweeping below was the unmistakable evidence of life. Unmistakable-yet also baffling. It took the form of a wide-spaced row of slender columns, each a hundred feet from its neighbor and twice as high. They stretched into the distance, dwindling in hypnotic perspective, until the far ho­rizon swallowed them up. Alvin swung the ship to the right, and began to race along the line of columns, wondering as he did so what purpose they could ever have served. They were absolutely uniform, marching in an unbroken file over hills and down into val­leys. There was no sign that they had ever supported any­thing; they were smooth and featureless, tapering very slight­ly toward the top. Quite abruptly, the line changed its course, turning sharply through a right angle. Alvin overshot by several miles before he reacted and was able to swing the ship around in the new direction. The columns continued with the same unbroken stride across the landscape, their spacing perfectly regular. Then, fifty miles from the last change of course, they turned abrupt­ly through another right angle. At this rate, thought alvin, we will soon be back where we started. The endless sequence of columns had so mesmerized them fat when it was broken they were miles past the discontinuity before hilvar cried out and made alvin, who had noticed nothing, turn the ship back. They descended slowly, and they circled above what hilvar had found, a fantastic picion began to dawn in their minds-though at first neither dared mention it to the other. Two of the columns had been broken off near their base and lay stretched out upon the rocks where they had fallen. Nor was that all; the two columns adjoining the gap had bent outward by some irresistible force. _ There was no escape from the awesome conclusion. Alvin knew what they had been flying over; it was so thing he had seen often enough in lys, but until this mom the shocking change of scale had prevented recognition. "Hilvar," he said, still hardly daring to put his thou into words, "do you know what this is?" ` "it seems hard to believe, but we've been flying aro the edge of a corral. This thing is a fence-a fence l hasn't been strong enough." "people who keep pets," said alvin, with the nervous lain men sometimes use to conceal their awe, "should make sure they know how to keep them under control." hilvar did not react to his forced levity; he was staring the broken barricade, his brow furrowed with thought. "I don't understand it," he said at last. "Where could have got food on a planet like this? And why did it bred out of its pen? I'd give a lot to know what kind of animal was." "perhaps it was left here, and broke out because it ail hungry," alvin surmised. "Or something may have made it annoyed." "let's go lower," said hilvar. "I want to have a look the ground." they decended until the ship was almost touching barren rock, and it was then that they noticed that the ply was pitted with innumerable small holes no more than an inch or two wide. Outside the stockade, however, the groud was free from these mysterious pockmarks; they stopped ruptly at the line of the fence. "You are right," said hilvar. "It was hungry. But it wash an animal: it would be more accurate to call it a plant. Had exhausted the soil inside its pen, and had to find fry food elsewhere. It probably moved quite slowly; perhaps took years to break down those posts." alvin's imagination swiftly filled in the details he could never know with certainty. He did not doubt that hilvars analysis was basically correct, and that some botanical monster, perhaps moving too slowly for the eye to see, had foul a sluggish but relentless battle against the barriers that hemmed it in. It might still be alive, even after all these ages, rovin will over the face of this planet. To look for it, now, would be a hopeless task, since it would mean quartering the surface of an entire globe. They made a desultory search in the few square miles around the gap, and located one great circular patch of pockmarks almost five hundred feet across. Where the creature had obviously stopped to feed one could apply that word to an organism that somehow drew its nourishment from solid rock. As they lifted once more into space, alvin felt a strange weariness come over him. He had seen so much, yet learned so little. There were many wonders on all these planets, but what he sought had fled them long ago. It would be useless, he knew, to visit the other worlds of the seven suns. Even if there was still intelligence in the universe, where could he seek it now? He looked at the stars scattered like dust across the vision screen, and knew that what was left of time was not enough to explore them all. A feeling of loneliness and oppression such as he had never before experienced seemed to overwhelm him. He could un­derstand now the fear of diaspar for the great spaces of the universe, the terror that had made his people gather in the little microcosm of their city. It was hard to believe that, after all, they had been right. He turned to hilvar for support. But hilvar was standing, fists tightly clenched and with a glazed look in his eyes. His head was tilted on one side; he seemed to be listening, strain­ing every sense into the emptiness around them. "What is it?" said alvin urgently. He had to repeat the question before hilvar showed any sign of hearing it. He was still staring into nothingness when he finally replied. "There's something coming," he said slowly. "Something that i don't understand." it seemed to alvin that the cabin had suddenly become very cold, and the racial nightmare of the invaders reared up to confront him in all its terror. With an effort of will that sapped his strength, he forced his mind away from panic. "Is it friendly?" he asked. "Shall i run for earth?" hilvar did not answer the first question-only the second. His voice was very faint, but showed no sign of alarm or fear. It held rather a vast astonishment and curiosity, as if he had encountered something so surprising that he could not be bothered to deal with alvin's anxious query. "You're too late," he said. "It's already here."